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People take part in a No Pants Day 2014 flash mob on the London Underground, in London, Britain, 12 January 2014. The event is organized by Improv Everywhere and takes place in many cities across the world. The goal for the participants is to get on public transport dressed in normal winter clothes, but without pants while keeping a straight face. EPA/TAL COHEN ( BRITAIN NO PANTS DAY )

Katerina Marie, left, and Kevin Coleman participate in the No Pants Subway Ride annual event joining other pantless riders invading MARTA at the Civic Center station on Sunday, Jan. 12, 2014, in Atlanta. The staged event was organized by the group Impro Everywhere. (AP Photo/Atlanta Journal-Constitution, Curtis Compton) ( No Pants Subway Ride Georgia )

People in underwear wait for a train in the Sofia City subway as they take part in the 2014 No Pants Subway Ride on January 12, 2014 in the Bulgarian capital. Started by Improv Everywhere, the goal is for riders to get on the subway train dressed in normal winter clothes (without pants) and keep a straight face. DIMITAR DILKOFF/AFP/Getty Images ( 525937228 )

Participants in the13th annual International "No Pants Subway Ride" queue for tickets at a London underground station in London, on January 12, 2014. Starting in 2002 with only seven participants, the day is now marked in over 60 cities around the world. The idea behind "No Pants" is that random passengers board a subway car at separate stops in the middle of winter, without wearing trousers. The participants wear all of the usual winter clothing on their top half such as hats, scarves and gloves and do not acknowledge each other's similar state of undress. LEON NEAL/AFP/Getty Images ( 525939949 )

People taking part in the "No Pants Subway Ride" wait at a metro station in Mexico City on January 12, 2014. "No Pants Subway Ride" is an annual event in which transit passengers ride trains without wearing pants on January. The event is observed in dozens of cities worldwide. ANTONIO NAVA/AFP/Getty Images ( 525945006 )

People take part in a No Pants Day 2014 flash mob on the London Underground, in London, Britain, 12 January 2014. The event is organized by Improv Everywhere and takes place in many cities across the world. The goal for the participants is to get on public transport dressed in normal winter clothes, but without pants while keeping a straight face. EPA/TAL COHEN ( BRITAIN NO PANTS DAY )

A participant in the13th annual International "No Pants Subway Ride" enters a London underground station in London, on January 12, 2014. Starting in 2002 with only seven participants, the day is now marked in over 60 cities around the world. The idea behind "No Pants" is that random passengers board a subway car at separate stops in the middle of winter, without wearing trousers. The participants wear all of the usual winter clothing on their top half such as hats, scarves and gloves and do not acknowledge each other's similar state of undress. LEON NEAL/AFP/Getty Images ( 525939989 )

A man taking part in the "No Pants Subway Ride" rides a metro train in Washington on January 12, 2014. "No Pants Subway Ride" is an annual event in which transit passengers ride trains without wearing pants in January. The event is observed in dozens of cities worldwide. NICHOLAS KAMM/AFP/Getty Images ( 525945316 )

A woman takes part in a No Pants Day 2014 flash mob on the London Underground, in London, Britain, 12 January 2014. The event is organized by Improv Everywhere and takes place in many cities across the world. The goal for the participants is to get on public transport dressed in normal winter clothes, but without pants while keeping a straight face. EPA/TAL COHEN ( BRITAIN NO PANTS DAY )

A man taking part in the "No Pants Subway Ride" waits at a metro station in Mexico City on January 12, 2014. "No Pants Subway Ride" is an annual event in which transit passengers ride trains without wearing pants on January. The event is observed in dozens of cities worldwide. ANTONIO NAVA/AFP/Getty Images ( 525944978 )

People take part in a No Pants Day 2014 flash mob on the London Underground, in London, Britain, 12 January 2014. The event is organized by Improv Everywhere and takes place in many cities across the world. The goal for the participants is to get on public transport dressed in normal winter clothes, but without pants while keeping a straight face. EPA/TAL COHEN ( BRITAIN NO PANTS DAY )

The doors close as people taking part in the "No Pants Subway Ride" are seen on the platform at the Potsdamer Platz station on the U2 Subway line in Berlin on January 12, 2014. "No Pants Subway Ride", is an annual event in which transit passengers ride trains without wearing pants in January. The event is observed in dozens of cities worldwide. In the UK, where the word pants refers to underwear, the event has been translated as "No Trousers". ODD ANDERSEN/AFP/Getty Images ( 525936852 )

A woman taking part in the "No Pants Subway Ride" waits at a metro station in Buenos Aires on January 12, 2014. "No Pants Subway Ride" is an annual event in which transit passengers ride trains without wearing pants in January. The event is observed in dozens of cities worldwide. ALEJANDRO PAGNI/AFP/Getty Images ( 525949995 )

Some riders enter the New York subway in their underwear as they take part in the 2014 No Pants Subway Ride on January 12, 2014. Started by Improv Everywhere, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. TIMOTHY A. CLARY/AFP/Getty Images ( 525946801 )

People taking part in the "No Pants Subway Ride" wait at a metro station in Mexico City on January 12, 2014. "No Pants Subway Ride" is an annual event in which transit passengers ride trains without wearing pants on January. The event is observed in dozens of cities worldwide. ANTONIO NAVA/AFP/Getty Images ( 525945053 )

An elderly woman looks on young Ukrainians wearing no pants as they participate in the first 'No Pants Subway Ride' in Kiev, Ukraine, 12 January 2014. No Pants Subway Ride is an annual global event started in New York, USA in 2002. This is the first time that the event is organized in Ukraine. EPA/SERGEY DOLZHENKO ( UKRAINE NO PANTS SUBWAY RIDE )

People in underwear wait for a train in the Sofia City subway as they take part in the 2014 No Pants Subway Ride on January 12, 2014 in the Bulgarian capital. Started by Improv Everywhere, the goal is for riders to get on the subway train dressed in normal winter clothes (without pants) and keep a straight face. DIMITAR DILKOFF/AFP/Getty Images ( 525937296 )

Two riders in the New York City subway in the underwear as they take part in the 2014 No Pants Subway Ride January 12, 2014. Started by Improv Everywhere, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. TIMOTHY A. CLARY/AFP/Getty Images ( 525951440 )

Riders wait for a train in the New York subway in their underwear as they take part in the 2014 No Pants Subway Ride on January 12, 2014. Started by Improv Everywhere, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. TIMOTHY A. CLARY/AFP/Getty Images ( 525947286 )

A group of young women wearing no pants participate in the first 'No Pants Subway Ride' in Brussels, Belgium, 12 January 2014. No Pants Subway Ride is an annual global event started in New York, USA in 2002. This is the first time that the event is organized in the Belgian metro. EPA/OLIVIER HOSLET ( BELGIUM NO PANTS SUBWAY RIDE )

Three men participating in the annual event, No Pants Subway Ride, enter a subway car in Mexico City, Sunday, Jan. 12, 2014. The global event inspired by the comedic performance New York art group Improv Everywhere in 2002, involves metro riders boarding subway cars in the middle of winter without wearing pants while maintaining a straight face. (AP Photo/Marco Ugarte) ( Mexico No Pants Day )

Riders wait for a train in the New York subway in their underwear as they take part in the 2014 No Pants Subway Ride on January 12, 2014. Started by Improv Everywhere, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. TIMOTHY A. CLARY/AFP/Getty Images ( 525947826 )

People take part in a No Pants Day 2014 flash mob on the London Underground, in London, Britain, 12 January 2014. The event is organized by Improv Everywhere and takes place in many cities across the world. The goal for the participants is to get on public transport dressed in normal winter clothes, but without pants while keeping a straight face. EPA/TAL COHEN ( BRITAIN NO PANTS DAY )

Young Ukrainians wearing no pants participate in the first 'No Pants Subway Ride' in Kiev, Ukraine, 12 January 2014. No Pants Subway Ride is an annual global event started in New York, USA in 2002. This is the first time that the event is organized in Ukraine. EPA/SERGEY DOLZHENKO ( UKRAINE NO PANTS SUBWAY RIDE )

A participant of the No Pants Subway Ride prepares to board an approaching train on January 12, 2014 in Berlin, Germany. The annual event, in which participants board a subway car in January while not wearing any pants while behaving as though they do not know each other, began as a joke by the public prank group Improv Everywhere in New York City and has since spread around the world, with enthusiasts in around 60 cities and 29 countries across the globe, according to the organization's site. (Photo by Adam Berry/Getty Images) ( 462008733 )

A man with no pants takes part in the 'No Pants Metro Ride' in Brussels, Sunday, Jan. 12, 2014. The idea started years ago as a small prank in New York and has grown into an international celebration of silliness, with dozens of cities around the world participating each year. (AP Photo/Yves Logghe) ( Belgium No Pants Metro Ride )

Participants of the No Pants Subway Ride ride a train on January 12, 2014 in Berlin, Germany. The annual event, in which participants board a subway car in January while not wearing any pants while behaving as though they do not know each other, began as a joke by the public prank group Improv Everywhere in New York City and has since spread around the world, with enthusiasts in around 60 cities and 29 countries across the globe, according to the organization's site. (Photo by Adam Berry/Getty Images) ( 462008113 )

A rider waits for a train in the New York subway in his underwear as he takes part in the 2014 No Pants Subway Ride on January 12, 2014. Started by Improv Everywhere, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. TIMOTHY A. CLARY/AFP/Getty Images ( 525948198 )

People taking part in the "No Pants Subway Ride" remain on a metro train in Buenos Aires on January 12, 2014. "No Pants Subway Ride" is an annual event in which transit passengers ride trains without wearing pants in January. The event is observed in dozens of cities worldwide. ALEJANDRO PAGNI/AFP/Getty Images ( 525947020 )

Participants of the No Pants Subway Ride hold hands as a train approaches on January 12, 2014 in Berlin, Germany. The annual event, in which participants board a subway car in January while not wearing any pants while behaving as though they do not know each other, began as a joke by the public prank group Improv Everywhere in New York City and has since spread around the world, with enthusiasts in around 60 cities and 29 countries across the globe, according to the organization's site. (Photo by Adam Berry/Getty Images) ( 462008439 )